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양원존(Won-Jon Yang),오충석(Chung-Seog Oh) Korean Society for Precision Engineering 2022 한국정밀공학회지 Vol.39 No.5
The main shaft of a mechanical press inevitably includes significant stress concentrations that can trigger severe mechanical damage and finally lead to failure under repetitive use. In this study, an efficient procedure to quantitatively evaluate the fatigue life of the shaft system including the main shaft and its support bearings, based on the macroscopic failure analysis of the main shaft broken during actual use, was investigated. For this purpose, the bearing support was modeled as an elastic foundation, and the elastic foundation stiffness value was varied to determine the optimal value that best simulates the failure behavior, especially with respect to the failure location and failure sequence, of an actual shaft. While the finite element mesh size was kept the same, only the effect of elastic foundation stiffness was investigated. The optimum value for the main shaft investigated in this study was approximately 60 N/mm³, and the fatigue life of the shaft was evaluated based on the conventional maximum principal stress theory. Based on this, two modified designs to enhance the fatigue life of the existing shaft are proposed.
자유단조공법을 통한 중공형 메인샤프트 제조공정에 관한 연구
권용철(Yong Chul Kwon),강종훈(Jong Hun Kang),김상식(Sang Sik Kim) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.2
풍력발전기에서 메인 샤프트는 로터허브와 증속기를 연결하는 중요 부품 중 하나이며 주로 자유단조공법을 통하여 제조된다. 하지만 고 MW급 이상의 메인샤프트는 중량을 감소시키기 위하여 중공형 설계가 이루어지며 주조공법을 이용하여 제조되고 있다. 본 연구의 목적은 중공형 메인샤프트를 단조공법을 이용하여 생산할 수 있는 제조공정을 개발하는 것이다. 자유단조 공법의 공정설계 방법에 따라 중실형과 중공형 메인샤프트를 제조하기 위한 단조공정을 각각 설계하였다. 설계된 공정의 성형가능성을 확인하기 위하여 온도, 변형률 속도에 따른 유동응력을 열간압축실험을 통하여 구한 후 유한요소해석을 수행하였다. 유한요소해석을 통하여 단조업계에서 통상 행해지는 중실형 단조공법의 온도 및 변형률 등의 관리인자와 제안된 중공형단조공법의 인자를 비교하여 성형가능성을 예측하였다. 시제품 제작을 통하여 중공형 형상을 원소재회수율, 내부품질, 형상 및 치수 등에서 높은 생산성으로 제조가 가능함을 확인하였다. The main shaft is one of the key components connecting the rotor hub and gear box of a wind power generator. Typically, main shafts are manufactured by open die forging method. However, the main shaft for large MW class wind generators is designed to be hollow in order to reduce the weight. Additionally, the main shafts are manufactured by a casting process. This study aims to develop a manufacturing process for hollow main shafts by the open die forging method. The design of a forging process for a solid main shaft and hollow shaft was prepared by an open die forging process design scheme. Finite element analyses were performed to obtain the flow stress by a hot compression test at different temperature and strain rates. The control parameters of each forging process, such as temperature and effective strain, were obtained and compared to predict the suitability of the hollow main shaft forging process. Finally, high productivity reflecting material utilization ratio, internal quality, shape, and dimension was verified by the prototypes manufactured by the proposed forging process for hollow main shafts.
파면해석과 탄성지반강성이 적용된 유한요소해석을 통한 기계식 프레스 주축의 피로수명 개선
양원존,오충석 한국정밀공학회 2022 한국정밀공학회지 Vol.39 No.5
The main shaft of a mechanical press inevitably includes significant stress concentrations that can trigger severe mechanical damage and finally lead to failure under repetitive use. In this study, an efficient procedure to quantitativelyevaluate the fatigue life of the shaft system including the main shaft and its support bearings, based on the macroscopic failure analysis of the main shaft broken during actual use, was investigated. For this purpose, the bearing support was modeled as an elastic foundation, and the elastic foundation stiffness value was varied to determine the optimal value that best simulates the failure behavior, especially with respect to the failure location and failure sequence, of an actual shaft. While the finite element mesh size was kept the same, only the effect of elastic foundation stiffness was investigated. The optimum value for the main shaft investigated in this study was approximately 60 N/mm3, and the fatigue life of the shaft was evaluated based on the conventional maximum principal stress theory. Based on this, two modified designs to enhance the fatigue life of the existing shaft are proposed.
풍력용 중공형 메인샤프트의 열처리공정 최적화를 위한 예비 성형체 및 냉각방법 연구
권용철(Y. C. Kwon),김홍태(H. T. Kim),김상식(S. S. Kim) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
Main shaft is one of the most important mechanical components for wind turbine. Large forged parts are most being manufactured with hot open die forging. Then these components progress heat treatment process to increase mechanical properties. Heat treatment of Hollow Main Shaft is doing using forged part. One of the general defects of these parts is Quenching crack during heat treatment. In this paper, to prevent the Quenching crack, FE-Analysis is performed to determine the optimum perform design and Quenching method. This calculated results confirmed temperature, stress change and micro-structure distribution according to perform shape and cooling method during heat treatment cycle. From the results, the prototypes of Hollow Main Shaft were manufactured based on analyzed results, productivity was stable, Also To evaluate mechanical properties this part, Specimens for tensile test and impact test were taken various region of manufactured Hollow Main Shaft.
혈당 측정을 위한 채혈기구 메인 샤프트의 사출성형 시뮬레이션 및 시 사출에 관한 연구
백승엽,Baek, Seung Yub 한국금형공학회 2018 한국금형공학회지 Vol.12 No.2
In diabetics, daily blood glucose testing is generally required at home, and thus, performing blood collection several times a day using a blood line is essential. Blood collection in the home and in the hospital is a source of pain and is the second most common cause of infection. In blood collecting device generally consists of four major parts: inner-case, outer case, main shaft and triger, and the most import part among those for necessary functionality is the main shaft. Filling time and injection pressure, filling balance, strain-rate analysis of change based on availability of the product. The Moldflow of FEM simulation is used for the analysis of injection molding process. In this study, aims to create a technique for injection molding and manufacturing of a main shaft of a high-performance blood-collecting apparatus capable of automatically extracting a lancet to relieve pain through depth control of the lancet.
윤효진,남윤욱,김경로 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.4
During the field operation of the Korean MBT(Main Battle Tank), the multi- smoke projectile launching system failed to function. As a result of conducting analysis, it was confirm that the gear shaft of reducer was failed. Therefore, a study on improvement in impact resistance of the reducer was conducted. The reducer was improved impact resistance by changing the design and material of gear shaft. The reliability of modified reducer was investigated by finite element analysis, performance and environmental tests. As a result of analysis, a strength of the modified gear shaft was improved by about 20 times than before improvement. The results of performance and environmental test show that the modified reducer is applicable for Korean MBT under the severe conditions. The quality improvement of multi-smoke projectile launching system contributes to survivability of Korean MBT.
이중섭(Chung Seub Yi),서정세(Jeong Se Suh),송철기(Chul Ki Song),신유인(Yoo In Shin),박중환(Joong hwan Park) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
This study includes a numbering value analysis about lubrication system of transmission for commercial vehicle. We have tried to confirm the flow rate of lubricating oil from lubrication pipe in each part with a standard for oil flow rate from the oil pumps. The transmission for this research can be applied to a commercial vehicle which is over 15tons, tried to confirm the flow range from CFD. The results are also compared with the rotation and mass flow rate of main shaft. The mass flow rate increased according to an engine rpm from oil hole. And we checked flow characteristic at transient state. This study is believed to be the start for the optimal design of the lubricating system in the manual transmission.
상용차용 변속기 주축 내 윤활유 분포패턴에 관한 수치해석
이중섭(Chung Seub Yi),서정세(Jeong Se Suh),송철기(Chul Ki Song),신유인(Yoo In Shin),박중환(Joong hwan Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This study includes a numbering value analysis about lubrication system of transmission for commercial vehicle. We have tried to confirm the flow rate of lubricating oil from lubrication pipe in each part with a standard for oil flow rate from the oil pumps. The transmission for this research can be applied to a commercial vehicle which is over 15tons, tried to confirm the flow range from CFD. The results are also compared with the rotation and mass flow rate of main shaft. The mass flow rate increased according to an engine rpm from oil hole. This study is believed to be the start for the optimal design of the lubricating system in the manual transmission.
자동화 수동 변속기 윤활 회로상에서 주축 오일 홀 설계에 따른 윤활유 집중 분배 연구
김대원(Daewon Kim),이건승(Gunseung Lee),장시열(Siyoul Jang) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
대형 상용 차량은 핵심 동력 전달 장치로 자동화 수동 변속기(Automated Manual Transmission, AMT)를 사용한다. 이를 위하여 핵심 동력 전달 장치인 자동화 수동 변속기는 내부 부품의 냉각 및 윤활 성능을 증대 시켜 연비를 향상시키고 차량 전체의 구동 에너지 효율과 고 내구성을 위한 연구가 필수적이다. 본 연구에서는 AMT 윤활 회로 내의 유동해석을 통해 내부 유체 거동 특성을 파악한다. 특히, 본 내용에서는 AMT Main Shaft에서 가혹한 조건에 장시간 노출되고 저속 고토크 영역에서 저단을 지속적으로 사용하는 Splitter Part로의 윤활유 토출 유량 증대 시켜 윤활 및 냉각 측면을 향상시키기 위해 윤활 회로 설계를 개선하고 유량 집중 분배 설계 기술을 적용한다. 그리고 목표 모듈인 Splitter Part의 윤활 회로 설계를 변경하여 윤활유 공급 유량을 증대 시키고 기존 설계 모델과 배출 유량을 비교하여 해당 기술의 유효성을 확인한다.